Photos: Tuesday’s Atlas 5 rollout

Get a preview of Thursday’s United Launch Alliance Delta 4-Heavy rocket flight in these video highlights packages from previous missions by the big booster for NASA and the National Reconnaissance Office from Cape Canaveral in Florida and Vandenberg Air Force Base in California.

SpaceX is replacing two engines on the Falcon 9 booster set to launch four astronauts next month on the company’s first operational Crew Dragon flight to the International Space Station, following an investigation that revealed a subcontractor failed to adequately clean out narrow vent ports on multiple engines across the company’s fleet, officials said Wednesday.

Two U.S.-built Intelsat communications satellites destined for different missions fired into space from French Guiana just after sunset Wednesday, vaulting due east over the Atlantic Ocean before separating from their Ariane 5 launcher right on target in geostationary transfer orbit.